[Ocfs2-users] AoE+ocfs2 = Heartbeat write timeout to device

[Luis Freitas]

Sunil,

    Can I configure this heartbeat to use a high priority (realtime) schedulling?

     If I simply increase the timeout it still could timeout on heavy I/O situations, like several different threads queuing large amounts of writes. The kernel should know this is a high priority write so that it is put ahead of the queue.

Regards,
Luis

Sunil Mushran <Sunil.Mushran at oracle.com> wrote: The older 12 sec default timeout was too low. It has been bumped
up to 60 secs. The FAQ has details on this.

b52 at entrap.de wrote:
> Hi,
>
> I got a problem regarding 100Mbit Ethernet, AoE and ocfs2. I setup 2 boxes
> connected per 100Mbit ethernet to their Ata-over-Ethernet storage. The
> ocfs filesystem resides on such an AoE-Partition. If I produce high
> troughput to that ocfs-partition on one node, it reboots after some
> seconds.
>
> I use dd for testing, like dd if=/dev/zero of=test bs=1M count=1000
> If I write 100Mb of data to the disk everything is fine. If I write 1Gb of
> data to the disk, the node reboots after some seconds and prints the
> following error:
>
> (9,0):o2hb_write_timeout:167 ERROR: Heartbeat write timeout to device
> etherd/e402.0 after 12000 milliseconds
> (9,0):o2hb_stop_all_regions:1865 ERROR: stopping heartbeat on all active
> regions.
>
> This couldn't be caused by lost heartbeat packets. I setup a seperate
> network for heartbeat to track this problem.
>
> Actually I know that 100Mbit Ethernet is a bottleneck, but this should not
> cause the system to reboot, right? Even if I could switch to Gigbit
> Ethernet it may be the bottleneck in future..
>
> Someone experienced this already? Do you know how to solve this issue?
> Please help, I need to do some tests..
> Your help is really appreciated.
>
> Cheers,
> Holger
>
>
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>   


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